Strange VR problem with 30-110mm lens

When I turn the camera on, the VR of this nice lens is doing just well. But after about 10 minutes of use, the VR stops working. The camera feels warm, and if I turn the camera of and wait for a few minutes, I can put it on again and it all starts from the beginning...I have this problem with both the 1-J2 and the V1, so it's not a camera-defect.I'm not sending it back, but it's strange.